Many members here
ARE experts on 914s, having owned and restored numerous 914s over the course of many years. Personally, I've owned 5 914s since all the way back in 1971. I also own and restore early 911s and 912s, since the late '70s.
I've never seen a 914 transaxle without the mounting 'ears'. They are not bolt on items, they're integral to the nose cone - and the with the mounting hardware shown on your's, it's anybody's guess what it came out of - definitely
NOT a 914. Also, the shift lever is upside down from how a 914's tail-shifter transaxle emerges from the nose cone.
Core tail-shift transmissions aren't in-vogue, and if someone actually want's one they're typically inexpensive. Even if the gears, bearings and synchros were all good, it would still need gone through, evaluated and then resealed ... and a real 914 replacement nose cone sourced.
You're looking at $100. ~ $200. max for that one ... and no, I'm not in the market for one, so I'm not trying to 'low-ball' you